The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 29, 2015
Filed:
Apr. 23, 2015
Applicants:
Wangsheng Mei, Suzhou, CN;
Zhijun Chen, Suzhou, CN;
Zhiling Sui, Suzhou, CN;
Yan Xiao, Suzhou, CN;
Inventors:
Assignee:
FREESCALE SEMICONDUCOTR, INC., Austin, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L 27/14 (2006.01); H04L 27/156 (2006.01);
U.S. Cl.
CPC ...
H04L 27/1563 (2013.01);
Abstract
A demodulator suitable for demodulating binary FSK signals having a small difference between carrier frequencies uses a counter-timer technique for timing a fixed number FSK cycles and comparing a count value with a threshold when a frequency change is expected. By grouping a number of FSK pulses (or cycles) together in one measurement, speed requirements on the system clock used for the counter/timer measurements can be relaxed and tolerance to noise is also improved. The demodulator is particularly suitable for wireless charging applications.